The Integra DC 2 that's available on the net tops out at around 180 km/h and is very sluggish.
I played around with the power curve of the engine and the gear ratios, the car performs a lot better now. The top speed is now around 235 km/h, which is also more true to real specs.
Instructions: Unrar the file into the data folder of the Honda, overwriting old files.
Honda Integra Type-R DC2 gearbox & engine mod 2015-08-26
Modified engine & gearbox to better match real life performance